The next time it happens, you need to get the computer codes read. Any
dealer or good diagnostic shop can do a quick scan, and any experienced
engine or auto electrical technician can interpret it for you. The chances
are it's something minor, such as a loose gas cap.
The above just plugs into the OBD port. It then reports the error code 4
times. On the 5th read it also clears the engine light but you can
disconnect it before then until you fix the fault indicated by the code.
(Obviously, if you don't fix the fault the light will come on again)
If you live in the USA it appears that some independent car service
outlets may read the code for you for free. You can the look up the
reason for the reported code at
Interesting, AFAIK there are some docs online how to read those
codes an a bunch of other information without leaving the driver
seat, using the small LCD speedo display.
Haven't test it out, but can remember failure codes are supposed
to be displayed. Sorry, if this feature is missing from the US
The codes that can be read from the trip display are only dashboard codes.
You can't read OBDII from there. The sort of information you get is engine
temperature, battery voltage, speed in both MPH and KPH and so on.
In order to view this, with the ignition switched off hold down the trip
reset button. Whilst keeping the button depressed, start the engine. When
the trip display reads "TEST" release the button. The dials will self-test
by going to maximum display, then minimum, and will then read normally. You
can then repeatedly press the trip reset button to cycle through a whole
load of information. Some of this is obvious, some quite obscure.
A Google will reveal what the less obvious codes are.
Every Focus I've ever tried this on shows the code to indicate the fuel
gauge sender is faulty....
Try changing gas stations or brands of fuel.
If you are using a discount gas station, or supermarket gas station for
gas, sometimes you get gasoline with a slightly lower octane than regular
and this causes a misfire, which will set the MIL. If the engine does not
misfire again the MIL goes out and the code goes away.
Another thing to check would be ignition wires or it could also be a bad
I had the similar problem with my Focus and it drove the dealer nuts.
MIL came on, 2 days later it went out - no code set.
I switched to Esso for fuel instead of buying supermarket gas, and the
problem has not reappeared yet..
From time to time my engine light keeps lighting up & stays lit for a few
days & then goes out. I have no loss of power etc. I was told there a recall
or problem with this? maybe a sensor? anyone know what one? Don't want to
take to dealer they rip off. I was told its a easy & common fix.
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